Cancel close outlook form region

I was wondering how you can cancel the closing of an outlook form region.

I want to display a dialog to tell the user that the form is in开发者_运维知识库complete and a yes no option for continuing. But because FormRegionClosed event has a generic EventArgs object rather than a more specific version there is no equivalent I can see to the win forms e.Cancel property.

In case it helps, the form region is displayed on a contact and this is outlook 2007.

There is no way to cancel the form region closing. Even if you go up to a higher level (Inspector.Close) - you still can't cancel the closing.